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Once an alarm is raised, the emission is interrupted and can be resumed only once the cause of the alarm is
cleared.
5-2 Recovering missing power levels
This section mostly refers to output channels that are terminated by an optical fiber.
A specific attention is required with the delivery patch cable which should not be bent nor receive
mechanical damage (shear stress, punching, etc.) under any circumstances. The user is required to handle
the patch cable and their connectors with care, and also to have the necessary tools and knowledge to
inspect and clean the end tip of the fiber.
These tools are:
- A specific microscope to inspect the end tip of the fiber. Oxxius recommends using a 200x or 400x
magnification microscope.
- Some consumables to clean the optical connectors. Oxxius recommends using “type A” CLETOP tools
available from NTT-AT.
If, under normal operating conditions, the output power seems to be lower than its original value, then the
following steps will help you identifying its cause:
Output is nil at the
end of the delivery
fiber
1) Start by inspecting the external aspect of the patch cable, looking for
steep bend curves or mechanical damages. These might be the sign of a
severed optical fiber.
If that is the case, the patch cable needs to be replaced
2) Inspect both optical connectors of the delivery fiber using a dedicated
microscope (refer to the following chapter for detailed guidance). Clean
them if necessary. If one of the end facets is damaged near the fiber
core, then the optical connector needs to be re-polished, or replaced.
3) Try readjusting the fiber coupler in order to increase the throughput.
Refer to the following chapter, “Optimizing the coupling ratio”.
Insufficient power on
all laser sources
1) Inspect both optical connectors of the delivery fiber using a dedicated
microscope (refer to the following chapter for detailed guidance). Clean
them if necessary. If one of the end facets is damaged near the fiber
core, then the optical connector needs to be re-polished, or replaced.
2) Try readjusting the fiber coupler in order to increase the throughput.
Refer to the following chapter, “Optimizing the coupling ratio”.
Insufficient power on
only minority of laser
sources
Try readjusting the beam steering optics of the affected sources. Refer to
chapter 6.2, “Optimizing the delivered power”.
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